多学科优化中基于实例推理的气动近似模型

为提高飞机多学科优化效率，对气动近似计算模型进行了改进。在比值修正模型所构造的气动近似模型的基础上，引入了基于实例的推理技术对其加以改进。通过采用与飞机气动特性相关的参数作为实例属性，建立了飞机方案实例，并改进了实例检索公式，最后通过复用与当前方案最相似实例的修正因子改进了优化中的气动近似模型。以常规布局民用飞机概念设计为例，采用改进的气动近似模型进行了多学科优化研究。结果表明，对于具有大量设计变量的飞机方案优化问题，采用改进的气动近似模型能够有效提高计算精度与优化效率。

IMPROVED AERODYNAMIC APPROXIMATION MODEL WITH CASE-BASED REASONING TECHNIQUE FOR MDO OF AIRCRAFT

To increase the efficiency of the muhidisciplinary optimization of aircraft,an aerodynamic approximation model is improved.Based on the study of aerodynamic approximation model constructed by the scaling correction model,case-based reasoning technique is introduced to improve the approximation model for optimization.The aircraft case model is constructed by utilizing the plane parameters related to aerodynamic characteristics as attributes of cases,and the formula of case retrieving is improved.Finally,the aerodynamic approximation model for optimization is improved by reusing the correction factors of the most similar aircraft to the current one.The muhidisciplinary optimization of a civil aircraft concept is carried out with the improved aerodynamic approximation model.The results demonstrate that the precision and the efficiency of the optimization can be improved by utilizing the improved aerodynamic approximation model with case-based reasoning technique.